Recycling mica and carbonate-rich mine tailings in alkali-activated composites: A synergy with metakaolin
Niu, He; Abdulkareem, Mariam; Sreenivasan, Harisankar; Kantola, Anu M.; Havukainen, Jouni; Horttanainen, Mika; Telkki, Ville-Veikko; Kinnunen, Paivo; Illikainen, Mirja (2020-08-12)
Post-print / Final draft
Niu, He
Abdulkareem, Mariam
Sreenivasan, Harisankar
Kantola, Anu M.
Havukainen, Jouni
Horttanainen, Mika
Telkki, Ville-Veikko
Kinnunen, Paivo
Illikainen, Mirja
12.08.2020
Minerals Engineering
157
Elsevier
School of Energy Systems
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2020090267166
https://urn.fi/URN:NBN:fi-fe2020090267166
Tiivistelmä
The main objective of this paper was to investigate the alkali activation of mine tailings (MT) after mechanochemical activation and the effect of metakaolin (MK) addition. Finnish mica-rich tailings from a phosphate mine were studied as precursors for alkali-activated materials (AAM) with a potential application as a substitute for ordinary Portland cement (OPC). The principal physical properties (water absorption, apparent porosity and unconfined compressive strength) were measured for samples containing 30% to 70% tailings. Zeolite phases such as natrolite and cancrinite were observed and the formation of C-(N)-A-S-H1 and N-A-S-H gels was identified by XRD, DRIFT, FESEM-EDS and NMR technologies. A life cycle assessment (LCA) was conducted on specimens in comparison to OPC. This work indicated that phosphate MT can be recycled through alkali activation with lower CO2 emission compared to all-metakaolin geopolymers and that the binder phase formed at the most promising tailings contents (60– 70%) was C-(N)-A-S-H gel.
Lähdeviite
Niu, H., Abdulkareem, M., Sreenivasan, H., Kantola, A M., Havukainen, J., Horttanainen, M., Telkki, V V., Kinnunen, P., Illikainen, M. (2020). Recycling mica and carbonate-rich mine tailings in alkali-activated composites: A synergy with metakaolin. Minerals Engineering, Vol 157, 106535. DOI: 10.1016/j.mineng.2020.106535
Alkuperäinen verkko-osoite
https://www.sciencedirect.com/science/article/abs/pii/S0892687520303551?via%3DihubKokoelmat
- Tieteelliset julkaisut [1522]